[Swift 3.0] Fix crash for looking up sim id on real device (#62)
[Swift 3.0] Fix crash for looking up sim id on real device (#62)

* Fix crash for looking up sim id on real device

* Use better API to get env var that won't crash

* change unknown to os name

* Fix line length and lowercase the sim enum

* Remove NS prefix for Swift 3

dennisweissmann/DeviceKit,dennisweissmann/Basics,dennisweissmann/DeviceKit,dennisweissmann/Basics,dennisweissmann/DeviceKit,dennisweissmann/DeviceKit